On 04/26/2011 05:37 AM, Keith Smith wrote:
Hi,
Thank you for your help with this question.
I am doing an install of Qmail Toaster on CentOS 5.6 using the
documentation located at
http://wiki.qmailtoaster.com/index.php/CentOS_5_QmailToaster_Install
This is a test run to learn so I can do this in a production environment.
The docs say I need a DNS server. I am using my registrar's DNS. Do I
still need Bind or djbdns?
Thank you for your help!
--
There are 2 roles which are involved with DNS, an Authoritative server
and a Recursor. An Authoritative server answers queries about specific
domains which it 'owns', while a Recursor, aka caching nameserver,
answers queries about any host in general. The two roles are typically
implemented on different hosts, which is generally considered to be a
good practice. While they can be implemented on a single host, doing so
is more complicated, and has inherent security risks.
Your registrar's DNS will serve as the Authoritative DNS server for your
domain(s).
The inbound MTA portion of QMT (smtp) uses DNS quite a bit, so it's a
good idea to have a caching nameserver installed on the QMT host. This
minimizes network DNS traffic, although DNS packets (UDP) really don't
use much in the way of network resources to begin with.
I usually install the caching-nameserver package (or pdns-recursor), add
"nameserver 127.0.0.1" to the /etc/resolv.conf file, then forget about it.
--
-Eric 'shubes'
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